3) inside a greenhouse, different types of trees are kept at three different humidity levels. Do use are left for three years. One tree is left outside in normal conditions. The height of the trees are measured once a week

the one with no humidity is going to be taller

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.